Christopher Joseph Rudnisky MD MPH FRCSC


Drusen

Drusen are yellowish white deposits that build up beneath the retina. They are a normal result of aging but can also occur with eye disease, such as age-related macular degeneration (AMD). In people who have AMD, the tiny drusen grow together, form larger deposits, and harden. They can interfere with the normal function…

Photodynamic Therapy for Age-Related Macular Degeneration

Photodynamic therapy (PDT) is a treatment for wet age-related macular degeneration (wet AMD). It is not used to treat dry AMD. Photodynamic therapy may be recommended if you can’t have injections of medicines to treat your AMD or if these injections don’t work. 1 In photodynamic therapy, a light-sensitive medicine…

Diopter

The diopter is a unit of measurement used to describe how well a person sees. Farsightedness is measured in positive diopters, and nearsightedness is measured in negative diopters. Astigmatism is measured in diopters that can be either positive or negative. With diopters, the farther a measurement is from 0, the more…

Strabismus

Strabismus is a vision problem in which both eyes do not look at the same point at the same time. It usually develops during childhood and is sometimes called “crossed-eyes,” “walleye,” or “squint.” Normally, the muscles attached to each eye work together to move both eyes in the same direction at the same time…

Electrophysiology Tests for the Eyes

Vision is the result of electrical signals that travel between the retina and the part of the brain involved with vision (occipital cortex). Electrophysiology tests check to see how well this visual nerve pathway is sending electrical signals needed for vision. These tests measure electrical activity that occurs in your…